#ifndef SENTENCE_H
#define SENTENCE_H
#include<iostream>
struct Sentence {                   //内置的句子类
    std::string contents;
    int line;
    Sentence() = default;
    Sentence(std::string s,int l):contents(s),line(l){}
    ~Sentence(){ }
    friend bool operator==(Sentence &lhs,Sentence &rhs);
    friend bool operator!=(Sentence &lhs,Sentence &rhs);
    friend bool operator<(Sentence &lhs,Sentence &rhs);
    friend bool operator>(Sentence &lhs,Sentence &rhs);
};

#endif